Elbow of a breathing apparatus



FIG. 1 is a perspective view showing front, top and side surfaces of an elbow of a breathing apparatus.

FIG. 2 is a perspective view thereof, showing rear, bottom, and side surfaces;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for an elbow of a breathing apparatus, as shown and described. 